Heat transfer device



Jan. 3, 1933. J. E. BLACK HEAT TRANSFER DEVICE Filed April 8, 1931 "2Sheets-Sheet l l-l.

Black: RV

Jan. 3, 1933. J. E. BLACK HEAT TRANSFER DEVICE ZSheets-Sheet Filed April8. 1931 OR John E. Black a HIS ATTORNEY Patented Jan. 3, 1933 UNITEDSTATES PATENT OFFICE JOHN E. BLACK, OF BLUHSiON, NEW JERSEY, ASSIGNOR TOTHE BAIBCOCK & WIIICOZ COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATIONOFNEW JERSEY Application filed April 8,

This invention relates to heat transfer devices, and particularly to aheat transfer device in which a fluid at high temperature is brought inheat transfer relationship with a fluid at lower temperature andtransfers heat thereto. 7 An object of the invention is to provlde afluid heat transfer device, strong and compact, presenting a large heattransfer area to the fluids therein constituting the heating and heatreceiving mediums.

A specific object of the invention is to provide a strong and compactheat transfer device in which sensible heat of superheat in superheatedsteam is utilized to heat steam of lower temperature by passing thesuperheated steam through tubes contacted by the steam at lowertemperature.

Other objects will be apparent to those skilled in this particular artfrom the description in the specification in connection with thedrawings, in which- Fig. 1 is a sectional side view of an illustrativeembodiment of the invention;

Fig. 2 is an enlarged sectional side view of a structural detailthereof;

Figs. 3 and 4 are fragmentary views of a detail of the invention;

Fig. 5 is a sectional side view of another illul'strative embodiment ofthe invention; an

Fig. 6 is an enlarged view of a structural detail thereof.

In the embodiments of the invention that have been chosen for purposesof illustration, in Fig. 1 is shown a reheater which includes acylindrical casing 1, closed at itsupper portion by a head 2 and at itslower portion y a head 3. Flan es 4 are secured to the casing at theends t ereof, and the heads 2 and 3 are secured thereto by bolts 5.Drums 7 and 8 extend through the heads 2- and 3, respectively, into theinterior of the casing and are connected together by a nest of tubes 10which extend through the interior of the casing in a cylindricalcluster. A displaced member 11, in the form of a hollow cylinder withclosed ends, fills a hollow space in the interior of the nest of tubes.

As shown in more detail in Fig. 2 in conmu: 'rnmsrnn nEvicE Serial No.528,589.

nection with the drum 7 and head 2, the drum 7 has a sleeve 13 appliedthereto on that portion which extends through the head; this sleeve iscontacted by a gland 14 which hold packing 15 in place and insures asteam tight fit. A similar joint is provided in the caslng 3 for thedrum 8. A high pressure steam' inlet 16 is provided in the drum 7 and asimilar fitting, which is not shown in connection with this illustrativeembodiment of the invention, is provided for the drum '8 as an outlet.The drum 7 is made in sections secured to each other by bolts 17extending through flanges 18, provided on each drum section, and hasmanholes 20 at the end thereof. All of this structure is shown inconnection with the drum 7 in Fig. 2, and the drum 8 is similarlyconstructed.

The tubes 10 extend parallel tothe casing and have ends bent over, invarying lengths, as shown in Fig. 1, and these ends are expandedrespectively in the drums 7 and 8.

Members 21, as shown in detail in Figures 3 and 4, are insertedbetween'the walls of the drums 7 and 8 and the tubes 10 at the bendedportion of each tube and act as cantilever supports to prevent unduestress on the tubes at or near the juncture of said tubes with thedrums. By virtue ofthese members no harm is done the tubes by the strainputupon them when steam is admitted to the inside of the casing 1', forthough the pressure the steam exerts upon the movable drum heads tendsto force them apart the strain placed upon the tubes by such movement isrelieved by the cantilever members 21 above referred to.

Low pressure steam inlets 23 are sup lied in the lower portion of thecasing beyon the ends of the tubes 10, and low pressure stea'm outlets24 are supplied in the upper end of the casing beyond the upper end ofthe nest of tubes.

In the operation of this device, high pressure steam is admitted to thedrum 7 by the inlet 16 and flows through the tubes 10 to the drum 8where it is removed through a suitable outlet (not shown). Low pressuresteam is admitted to the interior of the casing by the inlets 23 andflows along the tubes 10 in contact therewith, and is removed from thecas- 100 ing through the outlets 24. The displacer member 11 and thesides of the-casin g l insure that the low pressure steam will sweepalong the tubes 10 which contain the superheated steam and preventsbypassing of the low pressure steam through the central portion of thetube nest. In this manner, the sensible heat of superheat in superheatedsteam is utilized to heat steam atlower pressure and temperature.

By virtue of the fact that the drums 7 and 8 and the tubes 10 containand are contacted by a high pressure fluid at higher temperature thanthe low pressure fluid which contacts the casing 1, during the operationof the device the expansion of the elements 7, 8 and 10 will be greaterthan the expansion of the casing 1. This difference in the extent ofexpansion and contraction between these elements is compensated for bymounting the parts with respect to each other so that relative movementis permitted. The gland or stuffing box structure previously describedpermits this relative movement and at the same time provides a steamtight joint.

In the illustrative embodiment of the invention shown in Fig. 5, thereheater herein depicted is similar in general character to the onedescribed in connection with Figs. 1 to 4, but in this reheater thedrums 7 and 8 comprise an inner flanged portion 25 disposed interiorlyof the casing and an outer flanged portion 26 disposed exterior-1y ofthe casing, and bolts 27 extending through the outer flanged portionhold the parts in assembled relation. This structure, of course, securesthe drums in fixed relation with respect to the casing 1, as the twodrums are fixedly secured by the stud bolts 27 to the casing heads 2 and3. The exterior ends of flanged and are closed by a plate 28 boltedthereto. The drum structure is shown in detail in Fig. 6.

To compensate for unequal expansion and contraction of the high pressuremembers 7,

8, 10 and the casing 1, the tubes 10 are arranged around the drums inhelical formation, so that during the operation of the device unequalexpansion and contraction are taken care of by the distortion of thetubes, Without injury or disruption to any of the elements making up thedevice. Since the drums 7and 8 in this illustrative modification of theinvention are fixedly secured to the casing,

the low pressure steam will not react against the drums as in themodification illustrated in Figs. 1 and 2 so that the cantilever members21 may be omitted.

In the operation of the device and in the other elements of thestructure making up a part of the'invention, the description applied tothe elements making up the device described in connection with Figs. 1to 4 applies equally to the embodiment of the invention the drums arecasing with drums disposed in the upper and 4 lower parts thereof andconnected by tubes arranged circumferentially thereabout, a cylindricaldisplacer member located on the inside portion of the tube group, asuperheated steam inlet to the upper drum, a steam outlet from the lowerdrum, and steam inlets and outlets in the casing so located that thesteam admitted thereto by the inlet flows along the tubes in contacttherewith and passes through the outlet.

2. In a heat transfer device, a cylindrical casing with drums disposedat the ends thereof and connected by a nest of tubes disposedcircumferentially thereabout, a cylindrical displacer member located inthe central portion of the tube nest, and means to pass vapor at hightemperature through the tubes while passing a vapor of lower temperaturealong the tubes in contact therewith.

3. In a heat transfer device, a flanged cylindrical casing with a headsecured to each end, a drum extending through. a stufiing box in eachhead in sliding relation therewith, a plurality of tubes connecting saiddrum extending through the casing in a hollow cylindrical cluster, and adisplacer member disposed within the hollow portion of the cylindricaltube cluster.

4. In a heat transfer device, a cylindrical casing with a headdetachably secured to each end, a drum extending through each head infixed relation therewith, and a nest of tubes connecting said drums andhelically arranged therebetween so that unequal expansion andcontraction of the drums and easing are permitted without disruption ofthe device.

5. In a heat transfer device, a cylindrical casing with a head securedin each end thereof, a drum extending through each head in fixedrelation thereto, a nest of tubes helically arranged and connecting saiddrums forming a hollow cluster, and a cylindrical displacer memberdisposed .within the hollow portion of said cluster.

6. In a heat transfer device, a casing with drums disposed at the endsthereof and connected by a nest of tubes disposed circumferentiallythereabout in helical formation, a displacer member located in thecentral portion of the tube nest, and means to pass vapor at hightemperature through the tubes while passing vapor at lower temperaturealong the tubes in contact therewith.

7. In a heat transfer device, a casing with drums disposed in the upperand lower parts thereof and connected by tubes arrangedcircumferentially thereabout in helical formation, a. displacer memberlocated on the inside portion of the tube group, a vapor inlet to theupper drum and a vapor outlet from the lower drum, and vapor inlets andoutlets in the casing so located that the vapor admitted thereto by theinlet flows along the tubes in contact therewith and passes through theoutlet.

8. In a heat transfer device, a casing with drums disposed at the endsthereof and connected by a nest of tubes disposed circumferentiallythereabout, a displacer member located in the central portion of thetube nest, means to pass vapor at high temperature through the tubeswhile passing vapor at lower temperature along the tubes in cona tacttherewith, and means to permit unequal expansion and contraction betweenthe high and low temperature members without disruption.

9. In a heat transfer device, a casing with drums disposed in the upperand lower parts thereof and connected by tubes arrangedcircumferentially thereabout, a displacer member located on the insideportion of the tube group, an inlet to the upper drum and an outlet fromthe lower drum, inlets and outlets in the casing so located that steamadmitted thereto by the inlet flows along the tubes in contact therewithand passes through the outlet, and means associated with the tubes andcasing to permit unequal expansion and contraction therebetween withoutdisruption.

10. In a heat transfer device, an elongated stahtiall annular space insaid casing between a j acent portions of said drums, a nest of tubesconnecting portions of said drums within said casing an extendingthroughout said annular space, fluid inlet and outlet connections tosaid casin adjacent the ends of said tube nest, and fluld inlet andoutlet nnections to said inlet and outlet drums, respectively, at pointsexternally of said casing.

JOHN E. BLACK.

casing of substantially circular cross-section,

40 inlet and outlet drums at opposite ends of said casing, means forminga substantially annular space in said casing between the adjacent endsof said drums, a nest of tubes connecting said drums and arranged insaid annular space, fluid inlet and outlet connections to said'casing,and fluid inlet and outlet connections to said inlet and outlet drumsrespectively.

' 11. In a heat transfer device, an elongated casing of substantiallycircular crosssection, inlet and outlet drums extending into oppositeends of said casing, means forming a substantially annular space in saidcasing between the adjacent ends of said drums,a nest of tubesconnecting said drums and arranged in said annular space, fluid inletand outlet connections to said casing adjacent opposite ends thereof,and fluid inlet and outlet connections to said inlet'and outlet drums,respectively, at points externally of said cas- 1n 12. In a heattransfer device, an elongated casing of substantially circularcross-section, inlet and outlet drums extending into spaced portions ofsaid casing, means forming a sub- (IERTHIFWATE 0d CQRRECTION.

Patent No. 1,892, 778. January 3, W33.

JQHN E. BLACK.

It is hereby certified that error appears in the printed specification0i tie abeve numbered patent requiring correction as ioiiows: Page i,iine 46, iior "displaced" read "dispiacer"; page 2, line 114, eiaim 5,for "in" read "to"; and that the said Letters Patent should be read withthese earrections therein that the same may conform to the record of thecase in the Patent Office.

Sigied and sealed this 28th day of March, A. D. 1933.

do idcerc (S al) Acting Commissioner of Patents

